Overhauled ACL support. This makes us compatible

with 'star' ACL handling, though there's still a
bit more work needed in this area.

Added 'write_open_fd' and 'read_open_fd' to simplify, e.g.,
tar's u and r modes.  Eliminated old 'write_open_file_position'
as a bad idea.  (It required closing/reopening files to
do updates, which led to unpleasant implications.)

Various other minor fixes, API tweaks, etc.

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